64187487261 has 32 divisors (see below), whose sum is σ = 97859120000. Its totient is φ = 41551367040.

The previous prime is 64187487253. The next prime is 64187487263. The reversal of 64187487261 is 16278478146.

64187487261 is a `hidden beast` number, since 64 + 1 + 87 + 487 + 26 + 1 = 666.

It is not a de Polignac number, because 64187487261 - 2³ = 64187487253 is a prime.

It is a super-3 number, since 3×64187487261³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64187487198 and 64187487207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64187487263) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 434121 + ... + 562881.

It is an arithmetic number, because the mean of its divisors is an integer number (3058097500).

Almost surely, 2^64187487261 is an apocalyptic number.

It is an amenable number.

64187487261 is a deficient number, since it is larger than the sum of its proper divisors (33671632739).

64187487261 is a wasteful number, since it uses less digits than its factorization.

64187487261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129306 (or 129300 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 54.

The spelling of 64187487261 in words is "sixty-four billion, one hundred eighty-seven million, four hundred eighty-seven thousand, two hundred sixty-one".